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trackpad scroll precision #107

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Merged
forketyfork merged 1 commit into from
Jan 14, 2026
Merged

trackpad scroll precision #107

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -92,7 +92,7 @@ See [Setup](#setup) section below for building from source.
- Type in the focused terminal
- Visual feedback indicator appears briefly when hotkeys are pressed
- **Keyboard Navigation**: Move the grid focus with ⌘↑/↓/←/→ and open the on-screen shortcut overlay via the ? pill in the top-right corner
- **Scrollback in Place**: Hover any terminal and use the mouse wheel to scroll history; typing snaps back to live output and a yellow strip in grid view shows when you're scrolled (10 MB per terminal, matching Ghostty's default)
- **Scrollback in Place**: Hover any terminal and use the mouse wheel or a trackpad to scroll history; small high-precision gestures accumulate via SDL's integer wheel deltas, typing snaps back to live output, and a yellow strip in grid view shows when you're scrolled (10 MB per terminal, matching Ghostty's default)
- **High-Quality Rendering**: SDL_ttf font rendering with SFNSMono (default system monospace font on macOS), glyph caching, vsync-aligned presentation (renders at display refresh rate), and cached grid tiles to reduce redraw work
- **Persistent State**: Automatically saves and restores window position/size and font size; user configuration is read-only and edited via Cmd+,
- **Font Size Adjustment**: Use Cmd+Plus/Minus (8–96px) to adjust font size (saved automatically)
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8 changes: 6 additions & 2 deletions src/main.zig
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Expand Up @@ -888,8 +888,12 @@ pub fn main() !void {
);

if (hovered_session) |session_idx| {
const raw_delta = scaled_event.wheel.y;
const scroll_delta = -@as(isize, @intFromFloat(raw_delta * @as(f32, @floatFromInt(SCROLL_LINES_PER_TICK))));
const ticks_per_notch: isize = SCROLL_LINES_PER_TICK;
const wheel_ticks: isize = if (scaled_event.wheel.integer_y != 0)
@as(isize, @intCast(scaled_event.wheel.integer_y)) * ticks_per_notch
else
@as(isize, @intFromFloat(scaled_event.wheel.y * @as(f32, @floatFromInt(SCROLL_LINES_PER_TICK))));
const scroll_delta = -wheel_ticks;
if (scroll_delta != 0) {
scrollSession(&sessions[session_idx], scroll_delta, now);
// If the wheel event originates from a touch/trackpad
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